72 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs . A May 2009 Features • 2M x 36 or 4M x 18. • On-chip delay-locked loop (DLL) for wide data valid window. • Separate read and write ports with concurrent read and write operations. • Two echo clocks (CQ and CQ) that are delivered simultaneously with data. • +1.8V core power supply and 1.5, 1.8V VDDQ, used with 0.75, 0.9V VREF. • HSTL input and output levels. • Registered addresses, write and read controls, byte writes, data in, and data outputs. • Synchronous pipeline read with early write operation. • Full data coherency. • Double data rate (DDR) interface for read and write input ports. • Boundary scan using limited set of JTAG 1149.1 functions. • Fixed 2-bit burst for read and write operations. • Byte write capability. • Clock stop support. • Fine ball grid array (FBGA) package - 15mm x 17mm body size - 1mm pitch - 165-ball (11 x 15) array • Two input clocks (K and K) for address and control registering at rising edges only. • Two input clocks (C and C) for data output control. • Programmable impedance output drivers via 5x user-supplied precision resistor. Description The 72Mb IS61QDB22M36 and IS61QDB24M18 are synchronous, high-performance CMOS static random access memory (SRAM) devices. These SRAMs have separate I/Os, eliminating the need for high-speed bus turnaround. The rising edge of K clock initiates the read/write operation, and all internal operations are self-timed. Refer to the Timing Reference Diagram for Truth Table on page 8 for a description of the basic operations of these SRAMs. The input address bus operates at double data rate. The following are registered internally on the rising edge of the K clock: • • • • • Read address Read enable Write enable Byte writes Data-in for early writes The following are registered on the rising edge of the K clock: Integrated Silicon Solution, Inc. Rev. A 05/14/09 • Write address • Byte writes • Data-in for second burst addresses Byte writes can change with the corresponding datain to enable or disable writes on a per-byte basis. An internal write buffer enables the data-ins to be registered half a cycle earlier than the write address. The first data-in burst is clocked at the same time as the write command signal, and the second burst is timed to the following rising edge of the K clock. During the burst read operation, the data-outs from the first burst are updated from output registers off the second rising edge of the C clock (1.5 cycles later). The data-outs from the second burst are updated with the third rising edge of the C clock. The K and K clocks are used to time the data-outs whenever the C and C clocks are tied high. The device is operated with a single +1.8V power supply and is compatible with HSTL I/O interfaces. 1 372Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs x36 FBGA Pinout (Top View) 1 2 3 4 5 6 7 8 9 NC/SA* W BW2 K BW1 R SA 10 11 A CQ B Q27 Q18 D18 SA BW3 K BW0 SA D17 Q17 Q8 C D27 Q28 D19 VSS SA SA SA VSS D16 Q7 D8 D D28 D20 Q19 VSS VSS VSS VSS VSS Q16 D15 D7 E Q29 D29 Q20 VDDQ VSS VSS VSS VDDQ Q15 D6 Q6 F Q30 Q21 D21 VDDQ VDD VSS VDD VDDQ D14 Q14 Q5 G D30 D22 Q22 VDDQ VDD VSS VDD VDDQ Q13 D13 D5 H Doff VREF VDDQ VDDQ VDD VSS VDD VDDQ VDDQ VREF ZQ J D31 Q31 D23 VDDQ VDD VSS VDD VDDQ D12 Q4 D4 K Q32 D32 Q23 VDDQ VDD VSS VDD VDDQ Q12 D3 Q3 L Q33 Q24 D24 VDDQ VSS VSS VSS VDDQ D11 Q11 Q2 M D33 Q34 D25 VSS VSS VSS VSS VSS D10 Q1 D2 N D34 D26 Q25 VSS SA SA SA VSS Q10 D9 D1 P Q35 D35 Q26 SA SA C SA SA Q9 D0 Q0 R TDO TCK SA SA SA C SA SA SA TMS TDI 9 10 11 NC/SA* NC/SA* CQ Note*: The following pins are reserved for higher densities: 10A for 144Mb, and 2A for 288Mb. x18 FBGA Pinout (Top View) 1 2 3 4 5 6 A CQ NC/SA* B NC Q9 C NC D 7 8 SA W BW1 K NC R SA SA CQ D9 SA NC K BW0 SA NC NC Q8 NC D10 VSS SA SA SA VSS NC Q7 D8 NC D11 Q10 VSS VSS VSS VSS VSS NC NC D7 E NC NC Q11 VDDQ VSS VSS VSS VDDQ NC D6 Q6 F NC Q12 D12 VDDQ VDD VSS VDD VDDQ NC NC Q5 G NC D13 Q13 VDDQ VDD VSS VDD VDDQ NC NC D5 H Doff VREF VDDQ VDDQ VDD VSS VDD VDDQ VDDQ VREF ZQ J NC NC D14 VDDQ VDD VSS VDD VDDQ NC Q4 D4 K NC NC Q14 VDDQ VDD VSS VDD VDDQ NC D3 Q3 L NC Q15 D15 VDDQ VSS VSS VSS VDDQ NC NC Q2 M NC NC D16 VSS VSS VSS VSS VSS NC Q1 D2 N NC D17 Q16 VSS SA SA SA VSS NC NC D1 P NC NC Q17 SA SA C SA SA NC D0 Q0 R TDO TCK SA SA SA C SA SA SA TMS TDI Note*: The following pins are reserved for higher densities: 2A for 144Mb. 2 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 ISSI 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ® Pin Description Symbol Pin Number Description K, K 6B, 6A Input clock. C, C 6P, 6R Input clock for output data control. CQ, CQ 11A, 1A Output echo clock. Doff 1H DLL disable when low. SA 3A, 9A, 4B, 8B, 5C, 6C, 7C, 5N, 6N, 7N, 4P, 5P, 7P, 8P 3R, 4R, 5R, 7R, 8R, 9R 2M x 36 address inputs. SA 10A, 3A, 9A, 4B, 8B, 5C, 6C, 7C, 5N, 6N, 7N, 4P, 5P, 7P, 8P, 3R 4R, 5R, 7R, 8R, 9R 4M x 18 address inputs. D0–D8 D9–D17 D18–D26 D27–D35 10P, 11N, 11M, 10K, 11J, 11G, 10E, 11D, 11C 10N, 9M, 9L, 9J, 10G, 9F, 10D, 9C, 9B 3B, 3C, 2D, 3F, 2G, 3J, 3L, 3M, 2N 1C, 1D, 2E, 1G, 1J, 2K, 1M, 1N, 2P 2M x 36 data inputs. Q0–Q8 Q9–Q17 Q18–Q26 Q27–Q35 11P, 10M, 11L, 11K, 10J, 11F, 11E, 10C, 11B 9P, 9N, 10L, 9K, 9G, 10F, 9E, 9D, 10B 2B, 3D, 3E, 2F, 3G, 3K, 2L, 3N, 3P 1B, 2C, 1E, 1F, 2J, 1K, 1L, 2M, 1P 2M x 36 data outputs. D0–D8 D9–D17 10P, 11N, 11M, 10K, 11J, 11G, 10E, 11D, 11C 3B, 3C, 2D, 3F, 2G, 3J, 3L, 3M, 2N 4M x 18 data inputs. Q0–Q8 Q9–Q17 11P, 10M, 11L, 11K, 10J, 11F, 11E, 10C, 11B 2B, 3D, 3E, 2F, 3G, 3K, 2L, 3N, 3P 4M x 18 data outputs. W 4A Write control, active low. R 8A Read control, active low. BW0, BW1, BW2, BW3 7B, 7A, 5A,5B 2M x 36 byte write control, active low. BW0, BW1 7B, 5A 4M x 18 byte write control, active low. VREF 2H, 10H Input reference level. VDD 5F, 7F, 5G, 7G, 5H, 7H, 5J, 7J, 5K, 7K Power supply. VDDQ 4E,8E,4F,8F,4G,8G,3H,4H,8H,9H,4J,8J,4K,8K,4L,8L Output power supply. VSS 4C, 8C, 4D, 5D, 6D, 7D, 8D, 5E, 6E, 7E, 6F, 6G, 6H, 6J, 6K, 5L, 6L, 7L, 4M, 5M, 6M, 7M, 8M, 4N, 8N Ground ZQ 11H Output driver impedance control. TMS, TDI, TCK 10R, 11R, 2R IEEE 1149.1 test inputs (1.8V LVTTL levels). TDO 1R IEEE 1149.1 test output (1.8V LVTTL level). NC 2A, 10A 2Mx36, No Connect NC 2A, 7A,1B,5B,9B,10B,1C,2C,9C,1D,9D,10D,1E,2E,9E,1F,9F,10F, 4Mx18, No Connect 1G, 9G,10G,1J,2J,9J,1K,2K,9K,1L,9L,10L,1M,2M,9M,1N,9N,10N, 1P, 2P, 9P Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 3 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® Block Diagram D (Data-In) 36 (or 18) Data Reg 36 (or 18) 36 (or 18) BWx 4 (or 2) 2M x 36 (4M x 18) Memory Array 72 (or 36) Output Driver W Control Logic 72 (or 36) Output Select R Add Reg Sense Amps 20 (or 21) Write/Read Decode Address Output Reg Write Driver 20 (or 21) 36 (or 18) Q (Data-Out) CQ, CQ (Echo Clock Out) K K C Clock Gen Select Output Control C SRAM Features Read Operations The SRAM operates continuously in a burst-of-two mode. Read cycles are started by registering R in active low state at the rising edge of the K clock. A second set of clocks, C and C, are used to control the timing to the outputs. A set of free-running echo clocks, CQ and CQ, are produced internally with timings identical to the data-outs. The echo clocks can be used as data capture clocks by the receiver device. When the C and C clocks are connected high, the K and K clocks assume the function of those clocks. In this case, the data corresponding to the first address is clocked 1.5 cycles later by the rising edge of the K clock. The data corresponding to the second burst is clocked 2 cycles later by the following rising edge of the K clock. A NOP operation (R is high) does not terminate the previous read. Write Operations Write operations can also be initiated at every rising edge of the K clock whenever W is low. The write address is provided 0.5 cycles later, registered by the rising edge of K. Again, the write always occurs in bursts of two. The write data is provided in an ‘early write’ mode; that is, the data-in corresponding to the first address of the burst, is presented 0.5 cycles earlier or at the rising edge of the preceding K clock. The data-in corresponding to the second write burst address follows next, registered by the rising edge of K. The data-in provided for writing is initially kept in write buffers. The information on these buffers is written into the array on the following write cycle. A read cycle to the last write address produces data from the write buffers. Similarly, a read address followed by the same write address produces the latest write data. The SRAM maintains data coherency. 4 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® During a write, the byte writes independently control which byte of any of the two burst addresses is written (see X18/X36 Write Truth Tables on page 9 and Timing Reference Diagram for Truth Table on page 8). Whenever a write is disabled (W is high at the rising edge of K), data is not written into the memory. RQ Programmable Impedance An external resistor, RQ, must be connected between the ZQ pin on the SRAM and VSS to enable the SRAM to adjust its output driver impedance. The value of RQ must be 5x the value of the intended line impedance driven by the SRAM. For example, an RQ of 250Ω results in a driver impedance of 50Ω. The allowable range of RQ to guarantee impedance matching is between 175Ω and 350Ω, with the tolerance described in Programmable Impedance Output Driver DC Electrical Characteristics on page 13. The RQ resistor should be placed less than two inches away from the ZQ ball on the SRAM module. The capacitance of the loaded ZQ trace must be less than 3 pF. The ZQ pin can also be directly connected to VDDQ to obtain a minimum impedance setting. ZQ must never be connected to VSS. Programmable Impedance and Power-Up Requirements Periodic readjustment of the output driver impedance is necessary as the impedance is greatly affected by drifts in supply voltage and temperature. At power-up, the driver impedance is in the middle of allowable impedances values. The final impedance value is achieved within 1024 clock cycles. Single Clock Mode This device can be also operated in single-clock mode. In this case, C and C are both connected high at power-up and must never change. Under this condition, K and K will control the output timings. Either clock pair must have both polarities switching and must never connect to VREF, as they are not differential clocks Depth Expansion Separate input and output ports enable easy depth expansion, as each port can be selected and deselected independently. Read and write operations can occur simultaneously without affecting each other. Also, all pending read and write transactions are always completed prior to deselecting the corresponding port. In the following application example, the second pair of C and C clocks is delayed such that the return data meets the data setup and hold times at the memory controller. Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 5 72 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs Application Example SRAM #1 D Vt R SA ZQ R=250Ω CQ CQ Q R W BW0 BW1 C C K K SRAM #4 ZQ R=250Ω CQ CQ D Q R W BW0 BW1 C C K K SA Data In Data Out Vt Address R R Vt W BW Memory Controller Return CLK Source CLK Return CLK Source CLK Vt Vt R=50Ω Vt=VREF SRAM1 Input CQ SRAM1 Input CQ SRAM4 Input CQ SRAM4 Input CQ Power-Up and Power-Down Sequences The following sequence is used for power-up: 1. The power supply inputs must be applied in the following order while keeping Doff in LOW logic state: 1) VDD 2) VDDQ 3) VREF 2. Start applying stable clock inputs (K, K, C, and C). 3. After clock signals have stabilized, change Doff to HIGH logic state. 4. Once the Doff is switched to HIGH logic state, wait an additional 1024 clock cycles to lock the DLL. NOTES: 1. The power-down sequence must be done in reverse of the power-up sequence. 2. VDDQ can be allowed to exceed VDD by no more than 0.6V. 3. VREF can be applied concurrently with VDDQ. 6 Integrated Silicon Solution, Inc. Rev. A 05/14/09 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® State Diagram Power Up Read NOP Read Write Read Read Write Load New Read Address Always (fixed) Write NOP Load New Write Address Read DDR Read Write Write Always (fixed) DDR Write Notes: 1. Internal burst counter is fixed as two-bit linear; that is, when first address is A0+0, next internal burst address is A0+1. 2. Read refers to read active status with R = low. Read refers to read inactive status with R = high. 3. Write refers to write active status with W = low. Write refers to write inactive status with W = high. 4. The read and write state machines can be active simultaneously. 5. State machine control timing sequence is controlled by K. The Timing Reference Diagram for Truth Table on page 8 is helpful in understanding the clock and write truth tables, as it shows the cycle relationship between clocks, address, data in, data out, and controls. All read and write commands are issued at the beginning of cycle “t”. Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 7 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® Timing Reference Diagram for Truth Table Cycle t t+1 Read A Write B t+2 Read C t+3 Write D K Clock K Clock W R BW 0,1,2,3 Address A B C D Data-In DB DB+1 DD DD+1 QA Data-Out QA+1 QC+2 QC+3 C Clock C Clock CQ Clock CQ Clock Clock Truth Table (Use the following table with the Timing Reference Diagram for Truth Table.) Clock Controls Data-In Data-Out Mode K R W DB DB+1 QA QA+1 Stop Clock Stop X X Previous state Previous State Previous state Previous state No Operation (NOP) L→ H H H X X High-Z High-Z Read A L→ H L X X X D out at C (t + 1.5) D out at C (t + 2) Write B L→ H X L D in at K (t) D in at K (t + 0.5) X X Notes: 1. The internal burst counter is always fixed as two-bit. 2. X = don’t care; H = logic “1”; L = logic “0”. 3. A read operation is started when control signal R is active low 4. A write operation is started when control signal W is active low. Before entering into the stop clock, all pending read and write commands must be completed. 5. For timing definitions, refer to the AC Characteristics on page 15,16. Signals must have AC specifications at timings indicated in parenthesis with respect to switching clocks K, K, C, and C. 8 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® X36 Write Truth Table Use the following table with the Timing Reference Diagram for Truth Table on page 8. K (t + 0.5) BW0 BW1 BW2 BW3 DB L→H L H H H D0-8 (t) Write Byte 1 L→H H L H H D9-17 (t) Write Byte 2 L→H H H L H D18-26 (t) Write Byte 3 L→H H H H L D27-35 (t) Write All Bytes L→H L L L L D0-35 (t) Abort Write L→H H H H H Don’t care Operation K(t) Write Byte 0 DB+1 Write Byte 0 L→H L H H H D0-8 (t + 0.5) Write Byte 1 L→H H L H H D9-17 (t + 0.5) Write Byte 2 L→H H H L H D18-26 (t + 0.5) Write Byte 3 L→H H H H L D27-35 (t + 0.5) Write All Bytes L→H L L L L D0-35 (t + 0.5) Abort Write L→H H H H H Don’t care Notes; 1. For all cases. W must be active low during the rising edge of K occurring at time t. 2. For timing definitions, refer to the AC Characteristics on page 15,16. Signals must have AC specifications with respect to switching clocks K and K. X18 Write Truth Table (Use this table with the Timing Reference Diagram for Truth Table on page 8.) K (t + 0.5) BW0 BW1 DB L→H L H D0–8 (t) Write Byte 1 on B L→H H L D9–17 (t) Write All Bytes on B L→H L L D0–17 (t) Abort Write on B L→H H H Don’t care Operation K(t) Write Byte 0 on B DB+1 Write Byte 1 on B+1 L→H L H D0–8(t + 0.5) Write Byte 2 on B+1 L→H H L D9–17(t + 0.5) Write All Bytes on B+1 L→H L L D0–17(t + 0.5) Abort Write on B+1 L→H H H Don’t care Notes; 1. Refer to Timing Reference Diagram for Truth Table on page 8. Cycle time starts at n and is referenced to the K clock. 2. For all cases, W must be active low during the rising edge of K occurring at t. 3. For timing definitions, refer to the AC Characteristics on page 15,16. Signals must have AC specs with respect to switching clocks K and K. Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 9 ISSI 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ® Absolute Maximum Ratings Item Symbol Rating Units Power supply voltage VDD -0.5 to 2.9 V Output power supply voltage VDDQ -0.5 to 2.9 V Input voltage VIN -0.5 to VDD+0.3 V VDOUT -0.5 to 2.6 V Data out voltage Operating temperature 1 o TA 0 to 70 Junction temperature TJ 110 o Storage temperature TSTG -55 to +125 o C C C Note: Stresses greater than those listed in this table can cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this datasheet is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 10 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 72 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs Recommended DC Operating Conditions (TA = 0 to +70° C) Parameter Maximum Units Notes 1.8 - 5% 1.8 + 5% V 1 VDDQ 1.4 1.9 V 1 Input high voltage VIH VREF +0.1 VDDQ + 0.3 V 1, 2 Input low voltage VIL -0.3 VREF - 0.1 V 1, 3 VREF 0.68 0.95 V 1, 5 VIN - CLK -0.3 VDDQ + 0.3 V 1, 4 Supply voltage Output driver supply voltage Input reference voltage Clocks signal voltage 1. 2. 3. 4. 5. Symbol Minimum VDD Typical All voltages are referenced to VSS. All VDD, VDDQ, and VSS pins must be connected. VIH(Max) AC = See 0vershoot and Undershoot Timings. VIL(Min) AC = See 0vershoot and Undershoot Timings. VIN-CLK specifies the maximum allowable DC excursions of each clock (K, K, C, and C). Peak-to-peak AC component superimposed on VREF may not exceed 5% of VREF. 0vershoot and Undershoot Timings 20% Min Cycle Time VIL(Min) AC VDDQ+0.6V Undershoot Timing VDDQ GND VIH(Max) AC Overshoot Timing GND-0.6V 20% Min Cycle Time PBGA Thermal Characteristics Item Symbol Rating Units Thermal resistance junction to ambient (airflow = 1m/s) RΘJA 18.6 ° C/W Thermal resistance junction to case RΘJC 4.3 ° C/W Thermal resistance junction to pins RΘJB 1.77 ° C/W Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 11 ISSI 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs Capacitance (TA = 0 to + ® C, VDD = 1.8V -5%, +5%, f = 1MHz) Parameter Symbol Test Condition Maximum Units Input capacitance CIN VIN = 0V 4 pF Data-in capacitance (D0–D35) CDIN VDIN = 0V 4 pF Data-out capacitance (Q0–Q35) COUT VOUT = 0V 4 pF Clocks Capacitance (K, K, C, C) DC Electrical Characteristics (TA = 0 to + 70C, V DD = 1.8V -5%, +5%) Parameter Symbol Minimum Maximum x36 average power supply operating current (IOUT = 0, VIN = VIH or VIL) IDD33 — — 800 700 600 x18 average power supply operating current (IOUT = 0, V IN = VIH or V IL) IDD33 IDD40 IDD50 — — Power supply standby current (R = VIH, W = VIH. All other inputs = VIH or VIH, IIH = 0) ISB Notes mA 1, 3 800 700 600 mA 1, 3 — 200 mA 1 Input leakage current, any input (except JTAG) (VIN = VSS or V DD) ILI -2 +2 uA Output leakage current (VOUT = VSS or V DDQ, Q in High-Z) ILO -2 +2 uA Output “high” level voltage (IOH = -6mA) VOH VDDQ -0.4 VDDQ V Output “low” level voltage (IOL = +6mA) VOL VSS VSS+0.4 ILIJTAG -100 +100 JTAG leakage current (VIN = VSS or V DD) 1. 2. 3. 4. 5. 12 IDD40 IDD50 Units V uA 2, 4 2, 4 5 IOUT = chip output current. Minimum impedance output driver. The numeric suffix indicates the part operating at speed, as indicated in AC Characteristics on page 15, 16 JEDEC Standard JESD8-6 Class 1 compatible. For JTAG inputs only. Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® Typical AC Input Characteristics Item Symbol Minimum AC input logic high VIH (ac) VREF + 0.2 AC input logic low VIL (ac) Clock input logic high (K, K, C, C) VIH-CLK (ac) Clock input logic low (K, K, C, C) VIL-CLK (ac) 1. 2. 3. 4. Maximum Notes 1, 2, 3, 4 VREF - 0.2 VREF + 0.2 1, 2, 3, 4 1, 2, 3 VREF - 0.2 1, 2, 3 The peak-to-peak AC component superimposed on VREF may not exceed 5% of the DC component of VREF. Performance is a function of VIH and VIL levels to clock inputs. See the AC Input Definition diagram. See the AC Input Definition diagram. The signals should swing monotonically with no steps rail-to-rail with input signals never ringing back past VIH (AC) and VIL (AC) during the input setup and input hold window. VIH (AC) and VIL (AC) are used for timing purposes only. AC Input Definition K VREF K VRAIL VIH (AC) VREF Setup Time Hold Time VIL (AC) V-RAIL Programmable Impedance Output Driver DC Electrical Characteristics (TA = 0 to +70° C, VDD = 1.8V -5%, +5%, VDDQ = 1.5, 1.8V) Parameter Symbol Minimum Maximum Units Notes Output “high” level voltage VOH VDDQ / 2 VDDQ V 1, 3 Output “low” level voltage VOL VSS VDDQ / 2 V 2, 3 VDDQ- 1. IOH = ----------------2 ⁄ RQ -------- 5 ± 15% @ VOH = VDDQ / 2 For: 175Ω ≤RQ ≤350Ω. RQ VDDQ- ⁄ -------2. IOL = ---------------- 5 ± 15% @ VOL = VDDQ / 2 For: 175Ω ≤RQ ≤350Ω. 2 3. Parameter tested with RQ = 250Ω and VDDQ = 1.5V. Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 13 ISSI 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ® AC Test Conditions (TA = 0 to + 70C, VDD = 1.8V -5%, +5%, VDDQ = 1.5, 1.8V) Parameter Symbol Conditions Units VDDQ 1.5, 1.8 V Input high level VIH VREF + 0.5 V Input Low Level VIL VREF - 0.5 V 0.75, 0.9 V Output driver supply voltage Input reference voltage VREF Input rise time TR 0.35 ns Input fall time TF 0.35 ns Output timing reference level VREF V Clock Reference Level VREF V Notes 1, 2 Output load conditions 1. See AC Test Loading. 2. Parameter tested with RQ = 250 and VDDQ = 1.5V. AC Test Loading 50 Q 0.75, 0.9V 50 5pF Test Comparator 0.75, 0.9V 14 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 72 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs AC Characteristics (TA = 0 to + 70C, VDD = 1.8V -5%, +5%) Parameter Symbol 33 (300MHz) Units Min Max 3.3 7.5 ns 0.2 ns Notes Clock Cycle time (K, K, C, C) tKHKH Clock phase jitter (K, K, C, C) tKC-VAR Clock high pulse (K, K, C, C) tKHKL 1.32 ns Clock low pulse (K, K, C, C) tKLKH 1.32 ns Clock to clock (KH>KH, CH>CH) tKHKH 1.49 Clock to data clock (KH>CH, KH>CH) tKHCH 0.0 tKC-lock 1024 DLL lock (K, C) Doff Low period to DLL reset ns 0.8 ns cycle ns 5 Output Times C, C high to output valid tCHQV C, C high to output hold tCHQX C, C high to echo clock valid tCHCQV C, C high to echo clock hold tCHCQX CQ, CQ high to output valid tCQHQV CQ, CQ high to output hold tCQHQX 0.45 -0.45 0.40 -0.40 0.27 -0.27 0.45 ns 1, 3 ns 1, 3 ns 3 ns 3 ns 1, 3 ns 1, 3 ns 1, 3 ns 1, 3 C high to output high-Z tCHQZ C high to output low-Z tCHQX1 -0.45 Address valid to K, K rising edge tAVKH 0.35 — ns 2 Control inputs valid to K rising edge tIVKH 0.35 — ns 2 Data-in valid to K, K rising edge tDVKH 0.35 — ns 2 K rising edge to address hold tKHAX 0.35 — ns 2 K rising edge to control inputs hold tKHIX 0.35 — ns 2 K, K rising edge to data-in hold tKHDX 0.35 — ns 2 Setup Times Hold Times 1. See AC Test Loading on page 14 2. During normal operation, VIH, VIL, TRISE, and TFALL of inputs must be within 20% of VIH, VIL, TRISE, and TFALL of clock. 3. If C, C are tied high, then K, K become the references for C, C timing parameters. Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 15 72 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs AC Characteristics (TA = 0 to + 70C, VDD = 1.8V -5%, +5%) Parameter Symbol 40 (250MHz) 50 (200MHz) Units Min Max Min Max 4.0 7.5 5.0 7.5 ns 0.2 ns Notes Clock Cycle time (K, K, C, C) tKHKH Clock phase jitter (K, K, C, C) tKC-VAR Clock high pulse (K, K, C, C) tKHKL 1.6 2.0 ns Clock low pulse (K, K, C, C) tKLKH 1.6 2.0 ns Clock to clock (KH>KH, CH>CH) tKHKH 1.8 2.2 ns Clock to data clock (KH>CH, KH>CH) tKHCH 0.0 tKC-lock 1024 DLL lock (K, C) Doff Low period to DLL reset 0.2 0.8 0.0 0.8 cycle 1024 5 ns 5 ns Output Times C, C high to output valid tCHQV C, C high to output hold tCHQX C, C high to echo clock valid tCHCQV C, C high to echo clock hold tCHCQX CQ, CQ High to output valid tCQHQV CQ, CQ high to output hold tCQHQX 0.45 -0.45 0.45 -0.45 0.40 -0.40 0.4 -0.40 0.30 -0.30 0.35 -0.35 0.45 0.45 ns 1, 3 ns 1, 3 ns 3 ns 3 ns 1, 3 ns 1, 3 ns 1, 3 ns 1, 3 C High to output high-Z tCHQZ C High to output low-Z tCHQX1 -0.45 Address valid to K, K rising edge tAVKH 0.35 — 0.4 — ns 2 Control inputs valid to K rising edge tIVKH 0.35 — 0.4 — ns 2 Data-in valid to K, K rising edge tDVKH 0.35 — 0.4 — ns 2 K rising edge to address hold tKHAX 0.35 — 0.4 — ns 2 K rising edge to Control Inputs Hold tKHIX 0.35 — 0.4 — ns 2 K, K rising edge to data-in hold tKHDX 0.35 — 0.4 — ns 2 -0.45 Setup Times Hold Times 1. See AC Test Loading on page 15. 2. During normal operation, VIH, VIL, TRISE, and TFALL of inputs must be within 20% of VIH, VIL, TRISE, and TFALL of clock. 3. If C, C are tied high, then K, K become the references for C, C timing parameters.4. Specs cover -40C to +85C temperature range. 16 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 ISSI 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ® Read and Deselect Cycles Timing Diagram Read tKHKH tKHKL Read tKLKH NOP Read NOP K tKHKH K tKHAX tAVKH SA A1 A2 A3 tIVKH tKHIX R Q (Data Out) Q1-1 tKHKH Q2-1 Q2-2 Q3-1 tCHQV tKLKH tKHKL Q1-2 tCHQX tCHQX tCHQZ C tKLKH tCHQV C tCHCQV tCHCQX tCQHQV tCQHQX CQ tCHCQX tCHCQV CQ Don’t Care Undefined Notes: 1. Q1-1 refers to output from address A1+0, Q1-2 refers to output from address A1+1 (that is, the next internal burst address following A1+0). 2. Outputs are disabled one cycle after an NOP. Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 17 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® Write and NOP Timing Diagram Write Write NOP Write NOP tKLKH tKHKH tKHKL K tKHKH K tAVKH A1 SA tIVKH tKHAX A2 A3 tKHIX tKHIX W tIVKH tKHIX BW tKHDX tDVKH D(Data In) D1-1 D1-2 D2-1 D2-2 D3-1 D3-2 Don’t Care Undefined Notes: 1. D1-1 refers to input to address A1+0, D1-2 refers to input to address A1+1 (that is, the next internal burst address following A1+0). 2. BWx assumed active. 18 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® Read, Write, and NOP Timing Diagram Read Write Read Write Read Write NOP Write NOP K K SA A1 A2 A3 A4 A5 A6 A7 D2-1 D2-2 D4-1 D4-2 D6-1 D6-2 D7-1 D7-2 Q1-1 Q1-2 Q3-1 Q3-2 W BWx R D(Data In) Q(Data Out) Q5-1 Q5-2 C C CQ CQ Don’t Care Undefined Notes: 1. If address A1=A2, data Q1-1=D2-1, data Q1-2=D2-2. Write data is forwarded immediately as read results. Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 19 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® IEEE 1149.1 TAP and Boundary Scan The SRAM provides a limited set of JTAG functions to test the interconnection between SRAM I/Os and printed circuit board traces or other components. There is no multiplexer in the path from I/O pins to the RAM core. In conformance with IEEE Standard 1149.1, the SRAM contains a TAP controller, instruction register, boundary scan register, bypass register, and ID register. The TAP controller has a standard 16-state machine that resets internally on power-up. Therefore, a TRST signal is not required. Signal List • • • • TCK: test clock TMS: test mode select TDI: test data-in TDO: test data-out JTAG DC Operating Characteristics (TA = 0 to +70° C) Operates with JEDEC Standard 8-5 (1.8V) logic signal levels Parameter Symbol Minimum Typical Maximum Units Notes JTAG input high voltage VIH1 1.3 — VDD+0.3 V 1 JTAG input low voltage VIL1 -0.3 — 0.5 V 1 JTAG output high level VOH1 VDD-0.4 — VDD V 1, 2 JTAG output low level VOL1 VSS — 0.4 V 1, 3 1. 2. 3. All JTAG inputs and outputs are LVTTL-compatible. IOH1 = -2mA IOL1 = +2mA. JTAG AC Test Conditions (TA = 0 to +70° C, VDD = 1.8V -5%, +5%) Parameter Symbol Conditions Units Input pulse high level VIH1 1.3 V Input pulse low level VIL1 0.5 V Input rise time TR1 1.0 ns Input fall time TF1 1.0 ns 0.9 V Input and output timing reference level 20 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® JTAG AC Characteristics (TA = 0 to +70° C, VDD = 1.8V -5%, +5%) Parameter Symbol Minimum Maximum Units TCK cycle time tTHTH 20 — ns TCK high pulse width tTHTL 7 — ns TCk low pulse width tTLTH 7 — ns TMS setup tMVTH 4 — ns TMS hold tTHMX 4 — ns TDI setup tDVTH 4 — ns TDI hold tTHDX 4 — ns TCK low to valid data tTLOV — 7 ns Notes 1 1. See AC Test Loading on page 14. JTAG Timing Diagram tTHTL tTLTH tTHTH TCK tTHMX TMS tMVTH tTHDX TDI tDVTH TDO tTLOV Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 21 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® Scan Register Definition Register Name Bit Size x18 or x36 Instruction 3 Bypass 1 ID 32 Boundary Scan 109 ID Register Definition Field Bit Number and Description Part Revision Number (31:29) Part Configuration (28:12) JEDEC Code (11:1) Start Bit (0) 4M x 18 000 00def0wx0t0q0b0s0 000 101 001 00 1 2M x 36 000 00def0wx0t0q0b0s0 000 101 001 00 1 Part Configuration Definition: def = 011 for 72Mb wx = 11 for x36, 10 for x18 t = 1 for DLL, 0 for non-DLL q = 1 for QDB2, 0 for DDRII b = 1 for burst of 4, 0 for burst of 2 s = 1 for separate I/0, 0 for common I/O 22 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® Instruction Set Code Instruction TDO Output Notes 000 EXTEST Boundary Scan Register 2,6 001 IDCODE 32-bit Identification Register 010 SAMPLE-Z Boundary Scan Register 1, 2 011 PRIVATE Do not use 5 100 SAMPLE Boundary Scan Register 4 101 PRIVATE Do not use 5 110 PRIVATE Do not use 5 111 BYPASS Bypass Register 3 1. Places Qs in high-Z in order to sample all input data, regardless of other SRAM inputs. 2. TDI is sampled as an input to the first ID register to allow for the serial shift of the external TDI data. 3. BYPASS register is initiated to VSS when BYPASS instruction is invoked. The BYPASS register also holds the last serially loaded TDI when exiting the shift-DR state. 4. SAMPLE instruction does not place DQs in high-Z. 5. This instruction is reserved. Invoking this instruction will cause improper SRAM functionality. 6. This EXTEST is not IEEE 1149.1-compliant. By default, it places Q in high-Z. If the internal register on the scan chain is set high, Q will be updated with information loaded via a previous SAMPLE instruction. The actual transfer occurs during the update IR state after EXTEST is loaded. The value of the internal register can be changed during SAMPLE and EXTEST only. List of IEEE 1149.1 Standard Violations • • • • • 7.2.1.b, e 7.7.1.a-f 10.1.1.b, e 10.7.1.a-d 6.1.1.d JTAG Block Diagram TDI Bypass Register (1 bit) Identification Register (32 bits) TDO Instruction Register (3 bits) Control Signals TMS TAP Controller TCK Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 23 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® TAP Controller State Machine 1 Test Logic Reset 0 0 Run Test Idle 1 1 Select DR 0 0 1 1 Select IR 1 Capture IR Capture DR 0 0 0 Shift IR 0 Shift DR 1 1 1 1 Exit1 IR Exit1 DR 0 0 0 0 Pause DR Pause IR 1 1 Exit2 DR Exit2 IR 0 0 1 1 Update DR 0 24 1 Update IR 1 0 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI Order Pin ID Order Pin ID Order Pin ID 1 6R 37 10D 73 2C 2 6P 37 9E 74 3E 3 6N 39 10C 75 2D 4 7P 40 11D 76 2E 5 7N 41 9C 77 1E 6 7R 42 9D 78 2F 7 8R 43 11B 79 3F 8 8P 44 11C 80 1G 9 9R 45 9B 81 1F 10 11P 46 10B 82 3G 11 10P 47 11A 83 2G 12 10N 48 10A 84 1H 13 9P 49 9A 85 1J 14 10M 50 8B 86 2J 15 11N 51 7C 87 3K 16 9M 52 6C 88 3J 17 9N 53 8A 89 2K 18 11L 54 7A 90 1K 19 11M 55 7B 91 2L 20 9L 56 6B 92 3L 21 10L 57 6A 93 1M 22 11K 58 5B 94 1L 23 10K 59 5A 95 3N 24 9J 60 4A 96 3M 25 9K 61 5C 97 1N 26 10J 62 4B 98 2M 27 11J 63 3A 99 3P 28 11H 64 2A 100 2N 29 10G 65 1A 101 2P 30 9G 66 2B 102 1P 31 11F 67 3B 103 3R 32 11G 68 1C 104 4R 33 9F 69 1B 105 4P 34 10F 70 3D 106 5P 35 11E 71 3C 107 5N 36 10E 72 1D 108 5R 109 Internal ® Note: 1) NC pins as defined on FBGA pinouts on page 2 are read as “don’t cares”. 2) State of Internal pin (#109) is loaded via JTAG Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. A 05/14/09 25 372 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ISSI ® NOTE : 1. Controlling dimension : mm Package Outline 12/10/2007 26 Integrated Silicon Solution, Inc. — 1-800-379-4774 Rev. 00A 05/14/09 72 Mb (2M x 36 & 4M x 18) QUAD (Burst of 2) Synchronous SRAMs ORDERING INFORMATION Commercial Range: 0°C to +70°C Speed 300 MHz 250 MHz 200 MHz Order Part No. IS61QDB22M36-300M3 IS61QDB22M36-300M3L IS61QDB24M18-300M3 IS61QDB24M18-300M3L IS61QDB22M36-250M3 IS61QDB22M36-250M3L IS61QDB24M18-250M3 IS61QDB24M18-250M3L IS61QDB22M36-200M3L IS61QDB24M18-200M3L Integrated Silicon Solution, Inc. Rev. 05/14/09 Organization 2Mx36 2Mx36 4Mx18 4Mx18 2Mx36 2Mx36 4Mx18 4Mx18 2Mx36 4Mx18 Package 165 BGA 165 BGA, Lead-free 165 BGA 165 BGA, Lead-free 165 BGA 165 BGA, Lead-free 165 BGA 165 BGA, Lead-free 165 BGA, Lead-free 165 BGA, Lead-free 27